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12-10-2016
Mathematics

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A= a+b+c+d over 4 for c

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12-10-2016

[tex]A= \frac{a+b+c+d}{4} [/tex]
times 4 both sides
4A=a+b+c+d
minus (a+b+d) from both sides
4A-a-b-d=c
c=4A-a-b-d

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